Can I use GSM modem, which has no TCP/IP AT-commands?

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SMS & MMS Technical Forum » NowSMS Support - SMS Issues (Product Support Only) » Archive through February 02, 2006 » Can I use GSM modem, which has no TCP/IP AT-commands? « Previous || Next »
Author Message
Serg Mosichuk
New member
Username: Developer

Post Number: 2
Registered: 01-2006
Posted on Friday, January 20, 2006 - 06:58 am:   

I connected Siemens CFX65 to PC via com-port(RS232) for evaluating data exchange and I see:
>at
OK
>AT+CGDCONT=1,"IP","mms.my-mmsc.com"

OK
>ATD*99***1#

CONNECT
(there are hex-reps of incomming bytes):
7E FF 7D 23 C0 21 7D 21 7D 21 7D 20 7D 33 7D 22 7D 26 7D 20 7D 20 7D 20 7D 20 7D
23 7D 25 C2 23 7D 25 7D 27 7D 22 7D 28 7D 22 57 7D 30 7E

7E FF 7D 23 C0 21 7D 21 7D 21 7D 20 7D 33 7D 22 7D 26 7D 20 7D 20 7D 20 7D 20 7D
23 7D 25 C2 23 7D 25 7D 27 7D 22 7D 28 7D 22 57 7D 30 7E

7E FF 7D 23 C0 21 7D 21 7D 21 7D 20 7D 33 7D 22 7D 26 7D 20 7D 20 7D 20 7D 20 7D
23 7D 25 C2 23 7D 25 7D 27 7D 22 7D 28 7D 22 57 7D 30 7E

NO CARRIER

What is it?
I suppose I must establish connection with MMSC,
but what protocols can I use?
Is it WSP/WTP datagram (WAP-230/WAP259)?
Bryce Norwood - NowSMS Support
Board Administrator
Username: Bryce

Post Number: 5456
Registered: 10-2002
Posted on Friday, January 27, 2006 - 06:10 pm:   

Sorry, this is the technical support forum for the Now SMS/MMS Gateway product.

I have to give my priority attention to responding to technical support queries regarding our products.

To give a very brief answer, after the modem reports "CONNECT", there must be a PPP negotiation to establish a TCP/IP link.

The MM1 protocol for MMS is used, which uses the MMS Encapsulation format defined by the Open Mobile Alliance.

In many environments, MMS messages are transmitted over WSP/WTP/WDP, while sometimes HTTP is used. Either way, when an MMS notification is used to deliver an MMS message to a mobile phone, that part uses WAP push over WSP/WDP (connection-less push bypasses the WTP layer).

-bn

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